My brother popped the biggest wheelie I ever saw without going over backwards on our old AC WC when we were kids. We had a 110 gallon tank on the back, and when it was full, the front got REAL light. On the way to the back 40, he decided instead of going all the way around, he'd take a shortcut through the ditch. Big mistake! The tractor stood straight up and rested on the tank on the back. All he could do was hang on, but once it got on level ground, it came back down. He broke the hoses and PTO pump off of the tank and tractor, and wasted a whole tank of Treflan on the ground. I thought my Dad would kill him, but he was so thankful he was safe that he couldn't be too mad. No grass grew in that spot for about 3 years.